Homeostasis. The body must maintain a delicate balance of acids and bases.
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- Caitlin Cameron
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3 Homeostasis The body must maintain a delicate balance of acids and bases. Metabolic and respiratory processes must work together to keep hydrogen ion (H+) levels normal and stable.
4 ph of Blood The ph of blood indicates the concentration of H+ Normal ph Less than 7.35 is acidosis Greater than 7.45 is alkalosis
5 ph of Blood Principle substance affecting acid Carbon dioxide combines with water Partial pressure exerted by carbon dioxide mmhg Principle alkaline substance Bicarbonate, or HCO3- Slowly binds with free H+ making H2CO3 HCO3- levels 22-26
6 The body compensates for the imbalance The body strives to maintain a normal ph. Sometimes the causes of an acid-base imbalance can t be corrected or changed. In these cases a healthy renal or respiratory system can partially or completely offset the ill effects of a fluctuating ph.
7 Ex. The body compensates for the imbalance A pt with COPD may experience respiratory acidosis as a result of elevated CO2 levels caused by hypoventilation. Since both CO2 and HCO3- affect the ph, and the body is unable to correct the CO2 problem, the renal system compensates: excretion of H+ and reabsorption of bicarbonate Likewise, the respiratory system can compensate for a metabolic acid-base imbalance by regulating CO2 levels
8 Tic-tac-toe, three in a row To diagnose an acid-base imbalance, you need to ask yourself three questions: 1) Does the ph indicate acidosis or alkalosis? 2) Is the cause of the ph imbalance respiratory or metabolic? 3) Is there compensation for the acid-base imbalance?
9 To answer these questions ACID NORMAL ALKALINE ph PaCO mmhg HCO Once three items including the column head are in a vertical row, you are ready to diagnose the patient s condition.
10 Let s play tic-tac-toe Robert is a 70-year-old diabetic who has a long history of not taking his insulin. You are transferring him from one facility to another and his ABG results: ph 7.26 PaCO2 42 HCO3-17
11 ACID NORMAL ALKALINE ph PaCO2 HCO3-
12 The column that the ph is in tells you acidosis, or alkalosis. The relative positions of the ph, PaCO2, and HCO3- reveal the origin of any acidbase imbalance: If the ph and PaCO2 fall in the same column other than normal the problem is respiratory. If the ph and HCO3- fall in the same column, the problem is metabolic.
13 ACID NORMAL ALKALINE ph PaCO2 HCO3-
14 Look at the parameter not associated with the ph in this case PaCO2. Since the PaCO2 is normal, there is no evidence of compensation, and the full diagnosis is acute metabolic acidosis.
15 Causes of acid-base imbalances Metabolic acidosis Diabetic ketoacidosis Diarrhea Renal failure Shock Salicylate overdose Sepsis
16 Causes of acid-base imbalances Metabolic alkalosis Loss of gastric secretions Overuse of antacids Potassium-wasting diuretics
17 Causes of acid-base imbalances Respiratory acidosis Hypoventilation, may be related to: Drug overdose Chest trauma Pulmonary edema Airway obstruction COPD Neuromuscular disease
18 Causes of acid-base imbalances Respiratory alkalosis Hyperventilation, may be related to: Anxiety High altitude Pregnancy Fever Hypoxia Excessive tidal volume in ventilated patients Initial stage of pulmonary embolus
19 Let s play tic-tac-toe Elizabeth is brought to the ED following an auto accident. She sustained no injuries, but is extremely upset and anxious. She has been breathing rapidly since the crash and now feels faint. Her ABG results are: ph 7.49 PaCO2 30 HCO3-23
20 ACID NORMAL ALKALINE HCO3- ph PaCO2
21 Let s play tic-tac-toe Luis is a 64-year-old patient who has a long history of COPD. He presents today with a slight fever and complains of shortness of breath and coughing up green-colored sputum. His ABG results are: ph 7.26 PaCO2 52 HCO3-34
22 ACID NORMAL ALKALINE ph HCO3- PaCO2
23 With Luis notice the parameter not associated with the ph, in his case HCO3- and you will notice it is on the opposite side of the scale. This indicates partial compensation. If the compensation had been complete, the ph results would have been within the normal range
24 Let s play tic-tac-toe Kate was diagnosed with congestive heart failure six months ago and was placed on Lanoxin and Lasix. Her ABG results are: ph 7.48 PaCO2 51 HCO3-29
25 ACID NORMAL ALKALINE PaCO2 ph HCO3-
26 If ph is within the normal range but the other parameters are not, you re looking at a case of complete compensation. You will need to do one extra step to diagnose the origin of the imbalance. You will be noting two ph values on the grid.
27 You will be noting two ph values on the grid. Record the one in the normal range as ph(1) Recalculate ph using the exact midpoint of the normal range, or 7.40, for your reference point. Thus, a ph of less than 7.40 would indicate acidosis, and one greater than 7.40 would be alkalosis Note this adjusted ph in the appropriate box as ph(a)
28 Let s play tic-tac-toe Greta is a 45-year-old female and was diagnosed with myasthenia gravis five years ago. She is presenting today with increasing shortness of breath, even at rest. Her ABG results are: ph 7.36 PaCO2 50 HCO3-34
29 ACID NORMAL ALKALINE ph(a) ph(1) HCO3- PaCO2
30 Let s play tic-tac-toe Daniel is a 50-year-old executive who complains of indigestion and heartburn that has increased over the last six months. He says that he took a commercial antacid solution every half hour or so throughout the previous night for symptom relief. His ABG results are: ph 7.43 PaCO2 49 HCO3-30
31 ACID NORMAL ALKALINE PaCO2 ph(1) ph(a) HCO3-
32 Summary Treatment of any of these imbalances should be directed at correcting the underlying cause with immediate care focused on correcting the ph level.
33 And REMEMBER Although this tic-tac-toe technique is a convenient tool for interpreting a patient s blood gas values, do not allow it to overshadow the importance of the patient history and assessment when you are prioritizing your interventions.
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